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In page Elbe:

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From the early 6th century Slavic tribes (known as the Polabian Slavs) settled in the areas east of the rivers Elbe and Saale (which had been depopulated since the 4th century). In the 10th century the Ottonian Dynasty (dominant from 919 to 1024) began conquering these lands; a slow process of Germanization ensued, including the Wendish Crusade of 1147.[citation needed]